I was really disappointed that Wayne's speaking scenes were cut. Actually, I don't know if he had any in the first place, but all of the Farscapers know how much Scorpius' mannerisms and vocal inflections were very close to Peter Cushing's Tarkin.

I'm sure I read in the Making of ROTS book the Tarkin lookalikee actually wore a mask to make the likeness as near as possible. And as for speaking part - I don't think that was ever on the books, it isn't in the script (I have 2 versions - one in a pdf and one in the UK art of ROTS book). C-3P0 does get much screen time on ROTS, bit of a spare part really, so I think he got the honour of saying the last words in ROTS and then in ANH he says the first words of the Classic saga. It would kinda spoil the sequence if some opened their gob in the middle of the moving music